Bar screening helps in retaining solids from influent water in water treatment plants. Bar screening helps in the screening of large objects like cans, rags, roots or sticks from the influent sewage water. The water passes through the screens to remove plastic packets from the sewage water. Mostly, this is done with the help of a automated mechanically raked bar screen. Items which are removed by the process of bar screening are known as screenings which are collected in dumpsters to be disposed off later.
This primary infiltration flow makes a rose in water level which needs to be cleared to stop overflow. This mechanical filter has rectangular channel installations for removal of solids. The design is simple with continuous rotary motion. Bar screening machine has front clean and front return principle. These machines remove large and bulky objects that obstruct the sludge treatment effectiveness. This sludge makes the treatment and operation of sewerage water very complicated.
Bar screening is helpful in both small and large plants. Bar screening procedure have many benefits. First, they stop those materials which can damage and block pipe subsequently. Secondly, the reliability of the treatment is enhanced by using this procedure. Thirdly, the contagious waste is set aside to stop the recurring of many diseases.
Mostly middle screens are used for the process of bar screening. There are two types of screens, namely, coarse screens and fine screens. A coarse screen refers to the openings of 6mm or 0.25 in which helps in removal of large objects. A coarse screen is further divided into three types which are trash rack (used to remove very large objects and is of 38 to 150 mm or 1.5 to 6 in.), manually cleaned bar screen (facilities cleaning with opening of 30 to 50 mm or 1 to 2 in.) and mechanically cleaned bar screen (vertical angles with opening of 6 to 38 mm or 0.25 to 1.5 in.).
Fine screens are used to remove those problems which can create obstructions in the downstream process. Their openings in fine screens are of 1.5 to 6mm or 0.06 to 0.25 in. they basically reduce suspended solids.